Stratigraphy

Definitions

1. The study of rock layers and the layering process (stratification).
   countable, uncountable
2. The layering of deposits, with newer remains overlaying older ones, forming a chronology of the site.
   countable, uncountable

Equivalents

Examples

“The study⟳ of stratigraphy was at this point⟳ in its infancy, but it was already understood that different layers of rocks had been formed during different periods.”

“On Earth, we chart the history of waterways by looking at sediment that is deposited over time. We call⟳ that stratigraphy, the idea that water transports sediment and you can measure⟳ the changes on Earth by understanding the way that sediment piles up. That's what we've done here—but it's Mars.”

CEFR level